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To further understand 82C237 0peration, the states generated by each CLK cycle must be considered. The DMA controller operates in two major cycles, active and idle. After being programmed, the controller is normally idle until a DMA request occurs on an unmasked channel, or a software request is given. The 82C237 will then request control of the system busses and enter the active cycle. The active cycle is composed of several internal states, depending on what options have been selected and what type of operation has been requested.
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0 50 100 150 200 VR, REVERSE VOLTAGE (V) FIGURE 7. JUNCTION CAPACITANCE vs REVERSE VOLTAGE


I Any and all SANYO products described or contained applications that require extremely high levels of re control systems, or other applications whose failure physical and/or material damage. Consult with your any SANYO products described or contained herein